MD5即Message-Digest Algorithm 5（信息-摘要算法 5），用于确保信息传输完整一致。是计算机广泛使用的散列算法之一（又译摘要算法、哈希算法），主流编程语言普遍已有MD5实现。



将数据（如汉字）运算为另一固定长度值，是散列算法的基础原理，MD5的前身有MD2、MD3和MD4。

-MD5 Message-Digest Algorithm 5 (Information- Digest algorithm 5), is used to ensure complete and consistent information transmission. Computer widespread use one of the hash algorithm (also translated digest algorithm, hash algorithm), mainstream programming languages ​ ​ have generally MD5. Data (kanji) operator for another fixed-length value, is the basis of principle of the hashing algorithm, the predecessor of MD5 MD2, MD3 and MD4.